Green Day are working on the follow-up to their mega-selling and award-winning American Idiot album.

The 2004 long-play release earned the three-piece an audience not exclusively raised on punk rock, and now their sights are firmly set on matching that record's ambitiousness, if not bettering it. Singer
Billie Joe Armstrong - who doesn't have cancer - previously told MTV:

"At this point, to put a record out with, like, twelve songs on it and turn it in sounds a bit boring for us. So we want to definitely make something that is well thought out and all of our blood is put into."

A post on the band's official website, here, confirms that they're working on material right now:

"Billie, Mike and Tre are back from summer vacations working hard on new material for the next Green Day album. Stay tuned for more news next week."